'Were you there that day?' Inside Cantor Fitzgerald's 25-year odyssey of loss and resilience after 9/11

The trading floor of Cantor Fitzgerald before the 9/11 attacks that killed 658 employees. Courtesy Cantor Fitzgerald Relief Fund It's been 25 years since the 9/11 attacks, when 658 Cantor Fitzgerald employees were killed. Caroline Aiken Koster joined the firm the following year as it grieved and rebuilt. Below is her essay adapted from "The Families," a book marking the 9/11 anniversary. The financial firm Cantor Fitzgerald lost more employees on 9/11 than any other company: 658 killed after the first plane hit the North Tower of the World Trade Center. To mark the 25th anniversary of the terrorist attacks, The Cantor Fitzgerald Relief Fund has published a book, "The Families: 9/11 Anthology of Love, Loss, and Lessons of Resilience," edited by Edith Lutnick, cofounder, president, and executive director of the Cantor Fitzgerald Relief Fund, and Caroline Aiken Koster, the fund's general counsel.